CVE-2026-8356: The Document Foundation Libreoffice

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack. In fixed versions the unused second pass is no longer read into those tables.

Affected products

Published 2026-06-15. Last modified 2026-06-17.